Power supply device, vehicle equipped with power supply device, and power storage device

Abstract

A power supply device disposes an end plate at each end of a battery stack in a stacked direction of the battery stack, and couples a binding bar to the end plate, so as to fix battery cells. The binding bar includes a plate-shaped bar that extends in the stacked direction, and an engagement block that is provided on a plate-shaped bar and protrudes toward an outer peripheral face of the end plate. The engagement block is inserted into a fixing hole provided in the plate-shaped bar and fixed to an inner peripheral face of the fixing hole. The end plate includes a fitting part, to which the engagement block is guided, on the outer peripheral face of the end plate, and includes a stopper that is disposed closer to the battery stack with respect to the fitting part and abuts the engagement block.

The invention claimed is: 
     
       1. A power supply device comprising:
 a battery stack configured to have a plurality of battery cells stacked together; 
 a pair of end plates disposed at both ends of the battery stack in a stacked direction of the battery stack; and 
 a binding bar configured to have both ends of the binding bar coupled to the pair of end plates, wherein 
 the binding bar includes: a plate-shaped bar that extends in the stacked direction of the battery stack; and an engagement block that is provided on the plate-shaped bar and protrudes toward an outer peripheral face of each of the pair of end plates, 
 the engagement block is fixed to an inner peripheral face of a fixing hole provided in the plate-shaped bar in a state where the engagement block is inserted into the fixing hole, 
 one of the pair of end plates includes: a fitting part to which the engagement block is guided, on the outer peripheral face of the one of the pair of end plates; a stopper that is disposed at a side of the battery stack with respect to the fitting part and abuts the engagement block; and a clearance at a corner between the fitting part and the stopper, and 
 the engagement block is guided to the fitting part and is fixed to the outer peripheral face of the one of the pair of end plates. 
 
     
     
       2. A power supply device comprising:
 a battery stack configured to have a plurality of battery cells stacked together; 
 a pair of end plates disposed at both ends of the battery stack in a stacked direction of the battery stack; and 
 a binding bar configured to have both ends of the binding bar coupled to the pair of end plates, wherein 
 the binding bar includes: a plate-shaped bar that extends in the stacked direction of the battery stack; and an engagement block that is provided on the plate-shaped bar and protrudes toward an outer peripheral face of each of the pair of end plates, 
 the plate-shaped bar and the engagement block are made of a same metal material and are integrally formed with each other, 
 one of the pair of end plates includes: a fitting part to which the engagement block is guided, on the outer peripheral face of the one of the pair of end plates; a stopper that is disposed at a side of the battery stack with respect to the fitting part and abuts the engagement block; and a clearance at a corner between the fitting part and the stopper, and 
 the engagement block is guided to the fitting part and is fixed to the outer peripheral face of each of the pair of end plates. 
 
     
     
       3. The power supply device according to  claim 1 , wherein the engagement block is fixed to the outer peripheral face of the one of the pair of end plates with a plurality of bolts. 
     
     
       4. The power supply device according to  claim 3 , wherein
 the engagement block includes a guiding recess configured to prevent a head part of each of the plurality of bolts from protruding from a face of the engagement block, and 
 each of the plurality of bolts that has the head part guided to the guiding recess penetrates the engagement block to screw into a corresponding one of the pair of end plates. 
 
     
     
       5. The power supply device according to  claim 1 , wherein
 the plate-shaped bar and the engagement block are made of any one of iron, an iron alloy, stainless steel (SUS), aluminum, and an aluminum alloy. 
 
     
     
       6. The power supply device according to  claim 1 , wherein the engagement block has a width in the stacked direction of the plurality of battery cells, the width of more than or equal to 10 mm. 
     
     
       7. The power supply device according to  claim 1 , wherein each of the pair of end plates is made of metal. 
     
     
       8. An electric vehicle equipped with the power supply device according to  claim 1 , the electric vehicle comprising:
 a motor for driving, the motor to which the power supply device supplies power; 
 a vehicle body on which each of the power supply device and the motor is mounted; and 
 a wheel configured to be operated by the motor to drive the vehicle body. 
 
     
     
       9. A power storage device equipped with the power supply device according to  claim 1 , the power storage device comprising:
 a power supply controller configured to control charging to and discharging from the power supply device, wherein the power supply controller allows battery cells to be charged by power from an externally connected device and controls charging to the battery cells. 
 
     
     
       10. The power supply device according to  claim 2 , wherein the engagement block is fixed to the outer peripheral face of the one of the pair of end plates with a plurality of bolts. 
     
     
       11. The power supply device according to  claim 10 , wherein
 the engagement block includes a guiding recess configured to prevent a head part of each of the plurality of bolts from protruding from a face of the engagement block, and 
 each of the plurality of bolts that has the head part guided to the guiding recess penetrates the engagement block to screw into a corresponding one of the pair of end plates. 
 
     
     
       12. The power supply device according to  claim 2 , wherein
 the plate-shaped bar and the engagement block are made of any one of iron, an iron alloy, stainless steel (SUS), aluminum, and an aluminum alloy. 
 
     
     
       13. The power supply device according to  claim 2 , wherein the engagement block has a width in the stacked direction of the plurality of battery cells, the width of more than or equal to 10 mm. 
     
     
       14. The power supply device according to  claim 2 , wherein each of the pair of end plates is made of metal. 
     
     
       15. An electric vehicle equipped with the power supply device according to  claim 2 , the electric vehicle further comprising:
 a motor for driving, the motor to which the power supply device supplies power; 
 a vehicle body on which each of the power supply device and the motor is mounted; and 
 a wheel configured to be operated by the motor to drive the vehicle body. 
 
     
     
       16. A power storage device equipped with the power supply device according to  claim 2 , the power storage device further comprising:
 a power supply controller configured to control charging to and discharging from the power supply device, wherein the power supply controller allows battery cells to be charged by power from an externally connected device and controls charging to the battery cells.